CISA Known Exploited Vulnerability

CVE-2019-9621

Synacor · Zimbra Collaboration Suite (ZCS)

Synacor Zimbra Collaboration Suite (ZCS) Server-Side Request Forgery (SSRF) Vulnerability

Date added 2025-07-07

BOD 22-01 due date 2025-07-28

CWE CWE-918, CWE-807

Ransomware Unknown

CISA description

Synacor Zimbra Collaboration Suite (ZCS) contains a server-side request forgery (SSRF) vulnerability via the ProxyServlet component.

Required action

Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

Notes & references

https://wiki.zimbra.com/wiki/Zimbra_Security_Advisories
https://wiki.zimbra.com/wiki/Security_Center
https://nvd.nist.gov/vuln/detail/CVE-2019-9621

Where this lands in 800-53

Vulnerability data triggers these controls during assessment and continuous monitoring.

RA-5 · Vulnerability Monitoring and Scanning
SI-2 · Flaw Remediation
CM-6 · Configuration Settings
SI-7 · Software, Firmware, and Information Integrity
CM-8 · System Component Inventory

External lookups

NVD · CVE-2019-9621
CVE.org · CVE-2019-9621
CISA KEV catalog (canonical)